She's the mother of Sally Gardiner, a friend of Margaret 'Meg' March.

Meg, faithful and gentle, Jo, independent and energetic, Beth, quiet and shy, Amy, amiable and precocious&ndash;the four sisters live vigorously and happily at home with their gentle mother while waiting for their father to return from the Civil War. Helping each other, they challenge their fates and grow up to become wonderful women.

A summary of the full series aired as a TV special on BS Fuji in May, 2001. 
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One year later, the two-part summarised movie was published on DVD on May 25, 2002, manufactured and distributed by Bandai Visual Co., Ltd.

Mrs. Gardiner